Device for preventing offsetting in printing-machines



(No Model.)

j J. H. VIVIAN. DEVICE FOR PRBVENTING OPFSETTING IN PRINTING-V MACHINES.

No'. 417,297. Patented Dec. 17," `1889.

*gamma UNITED STATES PATENT OFFICE..

JOI'IN Il. VIVIAN, OF CHICAGO, ILLINOIS.l

DEVICE FOR PREVENTING OFFSETTING IN PRINTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 417,297, dated December 1'?, 18849.

Application tiled June 24, 1889` Serial No. 315,391. (No model.)

To a/ZZ whom, t may concern:

Be it known that I, JOHN H. VIVIAN, a subject of the Queen of Great Britain, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvementsin a Device for Preventing Offsetting on Printing-Machines, of which the following is a full and complete description.

I am aware that devices of various kinds have heretofore been employed for the purpose of preventing offsetting in the printing upon the reverse side of a sheet upon which there has already been printingwrecently done.

This invention may be placed upon a two or more cylinder web or handfed perfecting press or upon an ordinary two-revolution cylinder-press; and it consists, primarily, of a web spool or cylinder removably placed within the impression-cylinder of the press and having thereon suitable webbing, (I prefer paraliined papeig) such webbing passing around the impression-cylinder of the press to and around a second and duplicate web spool or cylinder, also removably placed within the impression-cylinder and interchange- -able with the first-named removable spool, and means whereby the last-named web spool or cylinder is actuated either automatically Vor at the will of the pressman operating the press. There the device is placed upon a two-cylinder web-perfecting press, it is of course placed upon the second impressioncylinder of the press-that is to say, upon the i1npression-cylinder by which the second side of the sheet is printed.

"When my device is placed on an ordinary two-revolution cylinder-press, such press is designed to be used in conjunction with a second press on which one side of the sheet is printed and from which the partially-printed sheet is transferred to the press on which my device is attached and the other side of the sheet printed while the iirst printed side is yet damp and undried or unset, and it is for the purpose of permitting such immediate transfer to and printing` on the second press that my device is applied to such second press.

I have illustrated my invention by the drawings accompanying this specification and forming a part hereof, in which- Figure I is an end elevation of an impression-cylinder of a printing-press with a portion of the end of the cylinder removed in order to expose to view the herein-described device. Fig. 2 is a sectional view of the impression-cylinder on line 2 2 of Fig. I, viewed in the direction of the arrows, an elevation of my device secured in suehimpression-cylinder, and a view of the respective connecting parts, whereby the device may be actuated. Fig. 3 is a sectional view of mechanism whereby one end of the web spools or cylinders may be secured invplace in the impression-cylinder.

The manner in which the other end of the web-spools may be secured in position in the impression-cylinder is plainly shown at the extreme right of Figf).

Like letters refer to like parts throughout the several views.

A is an impression-cylinder of the printingpress, A the shaft or axle thereof, and A that portion of the frame of the pressdireetly in contact with and forming the support for the axle of the impression-cylinder.

B is a web-spool or web-cylinder, upon which the offsetting webbing is wound from web-spool B.

B2 is a revoluble shaft placed in the end of cylinder A, and when the webspools B B', which are identical in construction, are placed in position in the im pression-cylinder this shaft B'2 forms a continuation of t-he shaft orV axle of the web-spools and revolves therewith.

B3 is a spring pressing against web-spool B', with proper tension to prevent such spool from unwinding too freely. Upon each end of the axle of the webspools B B there is formed the square hole b2, into which (when the web-spools are in position in impressioncylinder A) the square end b of pin h in shaft B2 is pressed by spring b3. The other end of the axles of the spools is held in recess a in the other end of the impression-cylinder A, as illustrated in Fig. 2. By withdrawing pin IOO the impression-cylinder and changed or replaced by others, which may bc kept in stock with various widths of webbing wound thereon suitable to differing sizes of forms.

The web-spools B B have at each end ot' the axles thereof the square hole 1)?, and may therefore be changed end for end at any time desired. I make use of this adaptability of changing the ends of the web-spool when inserting the same in the impression-cylinder in placing' the web-spool B, from which the webbing is unwound, so that either side of such webbing will come in contact with the sheet upon which the form is being' printed.y This enables me to use bothsidcs of the paraftine-paper for preventing' offsetting, and also by the hereinabovedescribed method to use paraftine-papcr of substantially the width of the form in use upon the press.

C is the webbing of any suitable material; but, as hereinbefore stated, I prefer to use parafned paper. This webbing C is wound on'Web-spool B from web-spool B whenever it is necessary -to change the part of the webbing which is around the impression-cylinder in 'order to prevent offsetting, and to thus wind the webbing upon the web-spool B, I place upon one of the shafts B2 beveled friction-wheel D, and upon the axle of the imi l'n'ession-cylinder, not turning therewith but adapted to slide thereon, I place a second beveled friction-wheel D. lVhen the webbing is to be wound upon the web spool or cylinder B, the friction-wheel D is slid into contact with spool friction-wheel D.

Then my device is placed upon an ordinary two-revolution cylint'ler-press, I prefer to arrange the friction-wheel D so that it may be slid by t-he pressman by handle d into such contact with wheel D as in practice, owing to the variable kind of matter printed on such presses and the differing sizes of the forms, I deem it preferable to have the amount of webbing wound on web-spool B, and the time when it is so wound completely within the control of such pressman.

Vhen the device is placed upon a two or more impression cylinder web perfecting press, the movement of the friction-wheel D may readily be made automatic, such automatic movement being secured by constructions adapted to actuate such friction-wheel D in a manner to bring it into contact with the friction-wheel D. I have not illustrated such mechanisms, as they do not form a necessary part of my invention.

E E are the common blai'iket-rods in the impression-cylinder, and F is the blanket secured to the rods E E.

The friction-wheels D D may, it is evident,be omitted from the device,particularly when such device is placed upon a two-revo-` lution cylinder-press, in which case in order to change the offset-webbing when necessary the press must be stopped in position, so that the web-spools, or one of them, may be turn ed by thehands. \\'hile an operative device is thus secured without the use of the friction-wheels I) D and mechanism adapted to bring them in contact wi'th each other I do not consider it advisable to so construct the device.

The manner in which this device operates is: 'After the press has been made ready to run with a suitable form thereon, web-spool B', having webbing C wound thereon, is placed within the impression-cylinder A, so that the webbing thereon may be unwound therefrom, thereby turning the 'web-spool B to the right or to the left, as the one or the other side of the webbing is to come in contact with the sheets being` printed on the press. The webbing C is then passed around the impression-cylinder A and secured to webspool B, which is also placed in position empty in the impression-cylinder A, as hereinbeiore described. The press is then run in the ordinary manner. If the movement of friction-wheel D on shaft or axle A be automatically regulated, and thereby brought into Contact with the friction-wheel D, it is so arranged that such contact will occur when no type or other part of the form from which the impression is secured on the paper on impression-cylinder A is in contact therewith or with the webbing' C. lVhen the movement of the friction-wheel D is controlled by the lever d', such wheel is brought in contact with the wheel D whenever and so long as the pressman thinks necessary to bring into position on the impression-cylinder A so much of the webbing C as is required to prevent otfsetting in the work being done.

Having thus described my invention and its method of operation, what I claim, and desire to secure by Letters Patent of the United States, isw y l. In a printing-press, the combination of an impression cylinder, interchangeable spools removably placed within such impression-cylinder, and webbing' wound upon one of the spools and adapted to be unwound therefrom to pass around the impression-cylinder over thc blanket thereof to the other of such spools and to be wound thereon, all substantially as described. l

2. In a printing-press, the combination of an impression cylinder, interchangeable spools having a square hole in the axle thereof at each end of such axle and adapted thereby to be changed end for end, removably placed within such impression-cylinder, and webbing wound around one of the spools and adapted to be unwound therefrom to pass around .the impression-cylinder over the blanket thereof to the other of such spools and to be wound thereon, all substantially as described.

3. In a printing-press, the combination of an impression-cylinder, spools placed within such impression-cylinder, webbing wound upon one of the spools and adapted to be unwound therefrom to pass around the cylinder IOO IIO

over the blanket thereof to the other of the spools and to be wound thereon, a Shaft forming' a continuation of the a-Xle of one of the spools, a frOtiOn-Wheel On such shaft, and a 'friction-wheel on the shaft o1 axle Of the impression-cylinder adjustably in Contact with the rst-nnmed friction-Wheel, all subsl'antinlly as described.

l. In L printing-press, the Combination of iimpression-CylinderA, Web-spoolsB B', shafts 1o B2 B2, webbing C, friction-wheels D D', and handle d', all substantially as described.

JNO. H. VIVIAN.

litnessesz FLORA L. BROWN, CHARLES T. BROWN. 

